Abdi Ahmad, Pishkenari Hossein Nejat, Keramati Ramtin, Minary-Jolandan Majid
Center of Excellence in Design, Robotics and Automation (CEDRA), School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran.
Nanotechnology. 2015 May 22;26(20):205702. doi: 10.1088/0957-4484/26/20/205702. Epub 2015 Apr 27.
Atomic force microscopy (AFM), as an indispensable tool for nanoscale characterization, presents major drawbacks for operation in a liquid environment arising from the large hydrodynamic drag on the vibrating cantilever. The newly introduced 'Trolling mode' (TR-mode) AFM resolves this complication by using a specialized nanoneedle cantilever that keeps the cantilever outside of the liquid. Herein, a mechanical model with a lumped mass was developed to capture the dynamics of such a cantilever with a nanoneedle tip. This new developed model was applied to investigate the effects of the needle-liquid interface on the performance of the AFM, including the imaging capability in liquid.
原子力显微镜（AFM）作为纳米级表征的必备工具，在液体环境中操作时存在重大缺陷，这是由振动悬臂上的巨大流体动力阻力引起的。新引入的“拖钓模式”（TR模式）原子力显微镜通过使用专门的纳米针悬臂解决了这一复杂问题，该悬臂使悬臂保持在液体之外。在此，开发了一个具有集中质量的力学模型，以捕捉这种带有纳米针尖的悬臂的动力学特性。这个新开发的模型被用于研究针 - 液体界面对原子力显微镜性能的影响，包括在液体中的成像能力。
